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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Property Classifications        
Total property, plant and equipment   $ 4,787,177 $ 3,787,137  
Accumulated depreciation and amortization   (804,142) (741,193)  
Property, plant and equipment, net   3,983,035 3,045,944  
Utility | Distribution facilities        
Property Classifications        
Total property, plant and equipment   $ 2,688,885 2,419,381  
Utility | Distribution facilities | Minimum        
Property Classifications        
Estimated Useful Lives   38 years    
Utility | Distribution facilities | Maximum        
Property Classifications        
Estimated Useful Lives   74 years    
Utility | Transmission facilities        
Property Classifications        
Total property, plant and equipment   $ 332,947 330,912  
Utility | Transmission facilities | Minimum        
Property Classifications        
Estimated Useful Lives   35 years    
Utility | Transmission facilities | Maximum        
Property Classifications        
Estimated Useful Lives   56 years    
Utility | Storage facilities        
Property Classifications        
Total property, plant and equipment   $ 79,922 79,916  
Utility | Storage facilities | Minimum        
Property Classifications        
Estimated Useful Lives   34 years    
Utility | Storage facilities | Maximum        
Property Classifications        
Estimated Useful Lives   47 years    
Nonutility | Solar property        
Property Classifications        
Total property, plant and equipment   $ 997,141 $ 879,597  
Nonutility | Solar property | Minimum        
Property Classifications        
Estimated Useful Lives 15 years 15 years 15 years 15 years
Nonutility | Solar property | Maximum        
Property Classifications        
Estimated Useful Lives 35 years 35 years 25 years 25 years
Nonutility | Storage and transportation property        
Property Classifications        
Total property, plant and equipment   $ 428,491 $ 28,445  
Nonutility | Storage and transportation property | Minimum        
Property Classifications        
Estimated Useful Lives   5 years    
Nonutility | Storage and transportation property | Maximum        
Property Classifications        
Estimated Useful Lives   50 years    
Nonutility | All other property        
Property Classifications        
Total property, plant and equipment   $ 259,791 $ 48,886  
Nonutility | All other property | Minimum        
Property Classifications        
Estimated Useful Lives   5 years    
Nonutility | All other property | Maximum        
Property Classifications        
Estimated Useful Lives   35 years